diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /epan/dissectors/packet-ms-nns.c | |
parent | Initial commit. (diff) | |
download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'epan/dissectors/packet-ms-nns.c')
-rw-r--r-- | epan/dissectors/packet-ms-nns.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/epan/dissectors/packet-ms-nns.c b/epan/dissectors/packet-ms-nns.c new file mode 100644 index 0000000..a364dc5 --- /dev/null +++ b/epan/dissectors/packet-ms-nns.c @@ -0,0 +1,209 @@ +/* packet-ms-nns.c + * Routines for .NET NegotiateStream Protocol (MS-NNS) dissection + * Copyright 2020, Uli Heilmeier <uh@heilmeier.eu> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wieshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +/* + * Basic dissector for .NET NegotiateStream Protocol based on protocol reference found at + * https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-NNS/%5bMS-NNS%5d.pdf + */ + +#include <config.h> + +#include <epan/packet.h> +#include <epan/conversation.h> + +/* Prototypes */ +void proto_reg_handoff_nns(void); +void proto_register_nns(void); + +static dissector_handle_t gssapi_handle; + + +#define MS_NNS_MESSAGE_HANDSHAKE_DONE 20 +#define MS_NNS_MESSAGE_HANDSHAKE_ERROR 21 +#define MS_NNS_MESSAGE_HANDSHAKE_PROGRESS 22 + +static const value_string nns_message_id_vals[] = { + { MS_NNS_MESSAGE_HANDSHAKE_DONE, "Handshake Done" }, + { MS_NNS_MESSAGE_HANDSHAKE_ERROR, "Handshake Error" }, + { MS_NNS_MESSAGE_HANDSHAKE_PROGRESS, "Handshake In Progress" }, + { 0, NULL} +}; + +struct nns_session_state { + guint32 handshake_done; + gboolean first_handshake_done; +}; + +static int proto_nns = -1; +static int hf_nns_message_id = -1; +static int hf_nns_major_version = -1; +static int hf_nns_minor_version = -1; +static int hf_nns_auth_payload_size = -1; +static int hf_nns_auth_payload = -1; +static int hf_nns_payload_size = -1; +static int hf_nns_payload = -1; + +static gint ett_nns = -1; +static gint ett_nns_payload = -1; + +#define MS_NNS_MIN_LENGTH 4 + +static int +dissect_nns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) +{ + proto_item *ti, *pti; + proto_tree *nns_tree, *payload_tree; + guint offset = 0; + guint32 message_id; + guint32 payload_size; + conversation_t *conversation; + tvbuff_t *nt_tvb; + gint remaining; + struct nns_session_state *session_state; + + if (tvb_reported_length(tvb) < MS_NNS_MIN_LENGTH) + return 0; + + conversation = find_or_create_conversation(pinfo); + + session_state = (struct nns_session_state *)conversation_get_proto_data(conversation, proto_nns); + if (!session_state) { + session_state = wmem_new0(wmem_file_scope(), struct nns_session_state); + conversation_add_proto_data(conversation, proto_nns, session_state); + } + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "MS-NNS"); + col_clear(pinfo->cinfo, COL_INFO); + + ti = proto_tree_add_item(tree, proto_nns, tvb, 0, -1, ENC_NA); + + nns_tree = proto_item_add_subtree(ti, ett_nns); + + /* As it is unknown if there is a one-way Handshake Done or a two-way Handshake Done we check the first frame + * after the first Handshake Done if it looks like a Handshake Done message (0x140100). */ + + if ( session_state->handshake_done && session_state->handshake_done < pinfo->num && + !(session_state->first_handshake_done && tvb_get_ntoh24(tvb, offset) == 0x140100)) { + proto_tree_add_item_ret_uint(nns_tree, hf_nns_payload_size, tvb, offset, 4, ENC_LITTLE_ENDIAN, &payload_size); + offset += 4; + col_append_str(pinfo->cinfo, COL_INFO, "Data"); + if ( payload_size > 0) { + remaining = tvb_reported_length_remaining(tvb, offset); + if ((guint32) remaining < payload_size) { + pinfo->desegment_offset = offset - 4; + pinfo->desegment_len = payload_size - remaining; + return (offset - 4); + } + proto_tree_add_item(nns_tree, hf_nns_payload, tvb, offset, payload_size, ENC_NA); + offset += payload_size; + session_state->first_handshake_done = FALSE; + } + } + else { + proto_tree_add_item_ret_uint(nns_tree, hf_nns_message_id, tvb, offset, 1, ENC_NA, &message_id); + offset += 1; + col_append_sep_fstr(pinfo->cinfo, COL_INFO, ", ", "%s", val_to_str_const(message_id, nns_message_id_vals, "Unknown Record")); + proto_tree_add_item(nns_tree, hf_nns_major_version, tvb, offset, 1, ENC_NA); + offset += 1; + proto_tree_add_item(nns_tree, hf_nns_minor_version, tvb, offset, 1, ENC_NA); + offset += 1; + proto_tree_add_item_ret_uint(nns_tree, hf_nns_auth_payload_size, tvb, offset, 2, ENC_BIG_ENDIAN, &payload_size); + offset += 2; + if ( payload_size > 0) { + if ((guint32) tvb_reported_length_remaining(tvb, offset) < payload_size) { + pinfo->desegment_offset = offset - 5; + pinfo->desegment_len = payload_size; + return (offset - 5); + } + pti = proto_tree_add_item(nns_tree, hf_nns_auth_payload, tvb, offset, payload_size, ENC_NA); + if (message_id == MS_NNS_MESSAGE_HANDSHAKE_DONE || message_id == MS_NNS_MESSAGE_HANDSHAKE_PROGRESS) { + nt_tvb = tvb_new_subset_length(tvb, offset, payload_size); + payload_tree = proto_item_add_subtree(pti, ett_nns_payload); + call_dissector(gssapi_handle, nt_tvb, pinfo, payload_tree); + } + offset += payload_size; + } + if ( message_id == MS_NNS_MESSAGE_HANDSHAKE_DONE) { + session_state->handshake_done = pinfo->num; + session_state->first_handshake_done = (session_state->first_handshake_done ? FALSE : TRUE); + } + } + return offset; +} + +void proto_register_nns(void) +{ + static hf_register_info hf[] = { + { &hf_nns_message_id, + { "MessageID", "ms-nns.message_id", + FT_UINT8, BASE_DEC, VALS(nns_message_id_vals), 0x0, + NULL, HFILL } + }, + { &hf_nns_major_version, + { "Major Version", "ms-nns.major_version", + FT_UINT8, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_nns_minor_version, + { "Minor Version", "ms-nns.minor_version", + FT_UINT8, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_nns_auth_payload_size, + { "Auth Payload Size", "ms-nns.auth_payload_size", + FT_UINT16, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_nns_auth_payload, + { "Auth Payload", "ms-nns.known_encoding", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_nns_payload_size, + { "Payload Size", "ms-nns.payload_size", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_nns_payload, + { "Payload", "ms-nns.payload", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + } + }; + + static gint *ett[] = { + &ett_nns, + &ett_nns_payload + }; + + proto_nns = proto_register_protocol(".NET NegotiateStream Protocol", "MS-NNS", "ms-nns"); + proto_register_field_array(proto_nns, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + register_dissector("ms-nns", dissect_nns, proto_nns); +} + +void proto_reg_handoff_nns(void) +{ + gssapi_handle = find_dissector("gssapi"); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 4 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * vi: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ |